Imaging of pulmonary malignant lymphoproliferative disorders.

Malignant pulmonary lymphomas are a heterogeneous group of malignancies characterized by the clonal proliferation of lymphocytes within the lung. They are classified as primary, arising in the lung without extrathoracic involvement (mostly MALT lymphoma), or secondary, resulting from the spread of systemic lymphoma, often diffuse large B-cell or Hodgkin lymphoma. Imaging findings correlate with histopathologic features, showing single or multiple nodules/masses, lobar or segmental consolidations, reticular patterns, or disseminated small nodules. Although a definitive diagnosis relies on histopathological and immunophenotypic analysis, imaging plays a crucial role in early suspicion, lesion localization, disease staging, and monitoring treatment response or recurrence.